Islam means submission. The religion of Islam is so named because it is based on obedience to God. A true believer in Islam is one who subordinates his thinking to God, who follows God’s dictates in all aspects of his life.
Islam is the religion of the entire universe. For the entire universe and all its parts are functioning in accordance with the law laid down by God.
Such behaviour is also desired of man. Man should also lead his life as God’s obedient servant just as the rest of the universe is fully subservient to God. The only difference is that the universe has submitted to God compulsorily, while man is required to submit to the will of God by his own choice.
When man adopts Islam, first of all it is his thinking, which comes under Islam, then his desires, his feelings, his interests, his relations, his loves and his hatred. All are coloured by his obedience to God’s will.
Source: The Spirit of Islam